6213221 has 16 divisors (see below), whose sum is σ = 7434240. Its totient is φ = 5080320.

The previous prime is 6213203. The next prime is 6213223. The reversal of 6213221 is 1223126.

It is not a de Polignac number, because 6213221 - 2⁶ = 6213157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6213221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6213223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25661 + ... + 25901.

It is an arithmetic number, because the mean of its divisors is an integer number (464640).

Almost surely, 2^6213221 is an apocalyptic number.

It is an amenable number.

6213221 is a deficient number, since it is larger than the sum of its proper divisors (1221019).

6213221 is a wasteful number, since it uses less digits than its factorization.

6213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404.

The product of its digits is 144, while the sum is 17.

The square root of 6213221 is about 2492.6333464832. The cubic root of 6213221 is about 183.8395438745.

Adding to 6213221 its reverse (1223126), we get a palindrome (7436347).

The spelling of 6213221 in words is "six million, two hundred thirteen thousand, two hundred twenty-one".